EP3964895A1 - Procédé de fabrication d'une pièce en matériau dur avec un insert en polymère - Google Patents

Procédé de fabrication d'une pièce en matériau dur avec un insert en polymère Download PDF

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Publication number
EP3964895A1
EP3964895A1 EP20194714.0A EP20194714A EP3964895A1 EP 3964895 A1 EP3964895 A1 EP 3964895A1 EP 20194714 A EP20194714 A EP 20194714A EP 3964895 A1 EP3964895 A1 EP 3964895A1
Authority
EP
European Patent Office
Prior art keywords
insert
green body
hard material
order
polymer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP20194714.0A
Other languages
German (de)
English (en)
French (fr)
Inventor
Paulo AREDE
Damien Cartier
Alexandre BRUTILLOT
Pierry Vuille
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Comadur SA
Original Assignee
Comadur SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Comadur SA filed Critical Comadur SA
Priority to EP20194714.0A priority Critical patent/EP3964895A1/fr
Priority to TW110129600A priority patent/TWI810626B/zh
Priority to EP21769111.2A priority patent/EP4208758A1/fr
Priority to PCT/EP2021/073582 priority patent/WO2022048983A1/fr
Priority to JP2023503436A priority patent/JP7529887B2/ja
Priority to CN202180054352.3A priority patent/CN116097179A/zh
Priority to US18/006,604 priority patent/US20230264396A1/en
Publication of EP3964895A1 publication Critical patent/EP3964895A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B3/00—Normal winding of clockworks by hand or mechanically; Winding up several mainsprings or driving weights simultaneously
    • G04B3/04—Rigidly-mounted keys, knobs or crowns
    • G04B3/041—Construction of crowns for rotating movement; connection with the winding stem; winding stems
    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
    • A44C27/00—Making jewellery or other personal adornments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/06—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of threaded articles, e.g. nuts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/24—Producing shaped prefabricated articles from the material by injection moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/28—Cores; Mandrels
    • B28B7/30—Cores; Mandrels adjustable, collapsible, or expanding
    • B28B7/303—Cores; Mandrels adjustable, collapsible, or expanding specially for making undercut recesses or continuous cavities the inner section of which is superior to the section of either of the mouths
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/34—Moulds, cores, or mandrels of special material, e.g. destructible materials
    • B28B7/342—Moulds, cores, or mandrels of special material, e.g. destructible materials which are at least partially destroyed, e.g. broken, molten, before demoulding; Moulding surfaces or spaces shaped by, or in, the ground, or sand or soil, whether bound or not; Cores consisting at least mainly of sand or soil, whether bound or not
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0001—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor characterised by the choice of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
    • B29C45/0055—Shaping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • B29C71/02—Thermal after-treatment
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
    • C04B35/111—Fine ceramics
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/48—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on zirconium or hafnium oxides, zirconates, zircon or hafnates
    • C04B35/486—Fine ceramics
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
    • C04B35/58—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
    • C04B35/584—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on silicon nitride
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B37/00—Cases
    • G04B37/06—Forming the passage for the winding stem through the case; Divided winding stems
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B37/00—Cases
    • G04B37/22—Materials or processes of manufacturing pocket watch or wrist watch cases
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B37/00—Cases
    • G04B37/22—Materials or processes of manufacturing pocket watch or wrist watch cases
    • G04B37/225—Non-metallic cases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B22F2003/1042—Sintering only with support for articles to be sintered
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/007—Hardness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/739—Horology; Equipment therefor
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
    • C04B2235/602—Making the green bodies or pre-forms by moulding
    • C04B2235/6022—Injection moulding
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
    • C04B2235/602—Making the green bodies or pre-forms by moulding
    • C04B2235/6028—Shaping around a core which is removed later
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance

Definitions

  • the invention relates to the field of the manufacture of ornamental parts, in particular in watchmaking, jewelery or telephony, the part being made of hard material. It relates more specifically to a method of manufacturing a watch part, for example a crown or a middle part, with an insert made of polymer material.
  • hard material we mean materials having a Vickers hardness greater than 1000 HV.
  • Such hard materials are, for example, ceramic, silicon nitride, zirconium oxide, sapphire, or alumina.
  • the ornamental parts are obtained after an injection step giving the desired shape to the part, then by a sintering step to harden the material.
  • the present invention provides this type of process. Thanks to the use of a hard material and an insert made of polymer material, the method makes it possible to avoid the direct machining of the hard material. Thus, the manufacturing cost of the part is reduced by avoiding machining the hard material as much as possible. In addition, this makes it possible to create holes with the chosen dimensions, with a thread if necessary.
  • the invention relates to a process for manufacturing a part, for example for watchmaking, jewelery or telephony, in particular a watch middle, the part comprising at least in part a hard material having a Vickers hardness greater than 1000 HV.
  • the method comprises an additional step of eliminating the polymer insert in order to obtain a part provided with a part having a predetermined shape, this step preceding the sintering step.
  • the method comprises an additional step of assembling the part.
  • the method comprises a step of machining the green body.
  • the overmolding step consists of overmolding the green body on an insert partly inserted into the green body in order to create a hole therein.
  • the overmolding step consists in overmolding the green body around the insert in order to create a closed cavity therein.
  • the insert comprises a thread in order to create an internal thread in the green body.
  • the polymer is to be chosen from the following list: PVD (for plasticized Polyvinyl Butyral), CAB (for Plasticized Cellulose Acetate Butyrate), acrylic resin of the PBMA type (for Polybutyl methacrylate).
  • the hard material is to be chosen from materials such as silicon nitride, zirconium oxide, alumina, cermets, metals or composites of these metals.
  • the invention also relates to an ornamental part, for example of watchmaking, jewelery or telephony, in particular a watch middle, comprising a body of hard material having a Vickers hardness greater than 1000 HV, the part being provided with a closed cavity in the thickness of the body.
  • the invention also relates to a watch case comprising such an ornamental piece, as well as a crystal and a bezel to hold the crystal on the piece, and a bottom to close the watch case.
  • the manufacturing process 1 of an ornamental piece 10, for example of watchmaking, jewelery or telephony, is represented on the figure 1 .
  • the ornamental piece is, for example, a watch case middle, a bezel, a watch case back, a stone or a timepiece pusher, a jewelry ring or bracelet, or even a telephone case. mobile.
  • Part 10 comprises at least in part a hard material having a Vickers hardness greater than 1000 HV.
  • the hard material is, for example, a ceramic material such as an aluminum oxide (Al2O3), a zirconium oxide (ZrO2), a carbide, a nitride, a cermet, a hard metal or any other Vickers hardness material. greater than 1000 HV.
  • Method 1 comprises a first step 2 of producing a precursor from a mixture of at least one powdered material with a binder.
  • the ceramic-based powder can comprise at least one metal oxide, a metal nitride or a metal carbide.
  • the ceramic-based powder may comprise aluminum oxide or a mixture of aluminum oxide and chromium oxide in order to form synthetic ruby, zirconium oxide, which may be optionally pigmented, alumina, which may be optionally pigmented, silicon nitride, cermets, metals and composites of these metals.
  • the cermets are for example titanium carbide or tungsten carbide.
  • the metals are for example tungsten, titanium, 316L stainless steel or steel, preferably without nickel.
  • the binder is of the organic type.
  • Method 1 comprises a second step 3 of producing an insert made of polymer material, the insert having at least partly a negative shape of that desired for at least part of the part.
  • the insert comprises at least one part in the negative shape of that desired for a part of the body in final hard material.
  • the polymer is for example chosen from the following list: PVD (for plasticized Polyvinyl Butyral), CAB (for plasticized Cellulose Acetate Butyrate), acrylic resin of the PBMA type (for Polybutyl methacrylate).
  • a third step 4 consists in overmolding the precursor onto the insert made of polymer material in order to form a green body.
  • Overmolding is in particular carried out by injection into a mould.
  • the mold has at least partly the shape of the desired part given a shrinkage coefficient of the part.
  • the precursor is injected into the mold through a tube, then through precursor distribution circuits throughout the mold.
  • the precursor thus takes the shape of the mould, for example a watch case middle as in the examples described in the application.
  • the green body takes the shape of the mold and at least n part of the shape of the insert on which it is overmolded.
  • the green body is machined to eliminate unnecessary parts of the green body produced by the injection. For example, tubing or channels formed because of the tube or distribution circuits of the injection system are eliminated. Thus, a machined green body is obtained.
  • the polymer insert is removed by thermal debinding.
  • the green body overmoulded on the insert is immersed in an alcohol bath at 80°.
  • the alcohol bath dissolves the polymer insert, so that the green body is obtained with the desired shape given by the insert.
  • thermal debinding can be carried out to remove the polymer insert.
  • the body overmoulded on the insert is thus heated to high temperature to make the polymer disappear.
  • the green body is therefore freed from the polymer insert.
  • the insert leaves a positive shape in the green body, like a tapped hole.
  • the sixth step 7 has the function of sintering said machined green body in order to form a body of the future part in said at least one hard material.
  • Sintering consists of heating the precursor so that the powder grains agglomerate.
  • the green body hardens by shrinking to result in a hard body with a sintering coefficient.
  • the sintering step may include pyrolysis.
  • the resulting part body is substantially hardened by this step.
  • the body of the piece has a definite shape.
  • a seventh step 8 may also be necessary to carry out satin finishing and/or polishing of the hard material.
  • the aesthetic appearance of the middle part is improved.
  • the part is assembled with other elements, for example by screwing, thanks to the shape obtained by the process.
  • the part is a middle part of a timepiece fitted with a tapped hole, a button or a crown is assembled on the middle part.
  • the insert 11 is a cylindrical element provided with a first 12 and a second 13 section, the second section 13 being intended to give an internal shape to the green body 10.
  • the second section 13 is narrower than the first 12 and has a thread 14 on its periphery.
  • the insert 11 makes it possible to form a cylindrical hole 15 in the green body 10, the hole 15 being provided with a thread 16 on the inner peripheral wall of the crown.
  • the finished part can be screwed during the assembly stage.
  • the precursor is overmolded on the insert 11, so that an assembly is obtained as represented on the figure 2b ).
  • a green body 10 in the shape of a watch crown has been formed on the insert 11.
  • the crown is cylindrical and has a thicker part 17 at one end.
  • the green body 10 is molded over the second section 13 of the insert 11, so that the second section 13 of the insert 11 is pressed into the green body 10.
  • a hole 15 is formed in the green body 11 shown in the figure 2c ).
  • the thread 14 of the insert 11 has printed a thread 16 in the hole 15 of the green body 10.
  • the figures 3a) and 3b) show another example of a part obtained using this process.
  • the part is a middle part 20 provided with a tapped hole 22, which facilitates the assembly of a button for example, by screwing the latter into the hole.
  • the hole 22 is arranged on the peripheral face 21 of the middle part. The enlargement of hole 22 on the figure 3b ) makes it possible to observe the tapping inside.
  • a middle part 29 of a watch includes a hole 35 provided with an internal thread 27 for screwing therein a tube 28 of crown 26.
  • Crown 26 comprises a tube 28 and a head 36 of crown 26 assembled together.
  • the tube 28 comprises a thread 37 on its peripheral wall cooperating with the internal thread 27 of the hole 35.
  • the middle part 20 with the threaded hole 35 is obtained thanks to the method according to the invention, in particular the threaded hole 35 is formed thanks to an insert in polymer.
  • FIG. 1 Another example of an ornamental piece produced using the method according to the invention is a bracelet link or link 30, represented on the figure 5 .
  • the link 30 is substantially flat and elongated.
  • the link comprises a longitudinal through-opening 34 to house therein a pin for assembly to a watch middle.
  • Link 30 has two holes threaded 31, 32, which allow the link 30 to be screwed to another link.
  • the holes 31, 32 are obtained thanks to a polymer insert.
  • the method also makes it possible to produce holes 31, 32 close to each other.
  • FIG. 6a An example of a system 40 for implementing the step of overmolding the link 30 is represented on the figures 6a) and 6b ).
  • Two molds 41, 42 in the form of a link are represented, each mold 41, 42 being arranged at the end of a conduit 43, 44 for supplying the precursor.
  • a main duct 46 makes it possible to inject the precursor, which is distributed in the two feed ducts 43, 44 as far as the molds 41, 42.
  • the molds 41, 42 have openings through which inserts 45 can be positioned.
  • Inserts 45, close-up on the figure 6a ), have a cylindrical shape, and are provided at least in part with a thread 47 device. The threaded part is inserted into the mold 41, 42 through an opening.
  • the method according to the invention also makes it possible to overmold a green body 50 around an insert 51 in order to create a closed cavity 52 therein.
  • the insert 51 is entirely surrounded by the precursor.
  • the polymer insert is then removed during the removal step in the same way as for a partially overmolded insert.
  • Such a method makes it possible, for example, to produce a lightened watch case, the case being partly empty of material.
  • the figure 7a shows a green body 50 in the shape of a watch middle, an insert 51 being enveloped in the material of the middle. When the insert 51 has disappeared, a void 52 appears in the thickness of material forming the caseband, as shown in the figure 7b ).
  • Such a method makes it possible to lighten the part, and to save material used to manufacture it.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Composite Materials (AREA)
  • Thermal Sciences (AREA)
  • Adornments (AREA)
  • Laminated Bodies (AREA)
EP20194714.0A 2020-09-04 2020-09-04 Procédé de fabrication d'une pièce en matériau dur avec un insert en polymère Withdrawn EP3964895A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
EP20194714.0A EP3964895A1 (fr) 2020-09-04 2020-09-04 Procédé de fabrication d'une pièce en matériau dur avec un insert en polymère
TW110129600A TWI810626B (zh) 2020-09-04 2021-08-11 製造由具有聚合物嵌入件之硬性材料製成的零件之方法
EP21769111.2A EP4208758A1 (fr) 2020-09-04 2021-08-26 Procede de fabrication d'une piece en materiau dur avec un insert en polymere
PCT/EP2021/073582 WO2022048983A1 (fr) 2020-09-04 2021-08-26 Procede de fabrication d'une piece en materiau dur avec un insert en polymere
JP2023503436A JP7529887B2 (ja) 2020-09-04 2021-08-26 ポリマー製インサートを用いて硬質材料によって作られた部品を製造する方法
CN202180054352.3A CN116097179A (zh) 2020-09-04 2021-08-26 用于制造具有聚合物插入件的由硬质材料制成的部件的方法
US18/006,604 US20230264396A1 (en) 2020-09-04 2021-08-26 Method for manufacturing a part made of a hard material with a polymer insert

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EP20194714.0A EP3964895A1 (fr) 2020-09-04 2020-09-04 Procédé de fabrication d'une pièce en matériau dur avec un insert en polymère

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EP21769111.2A Pending EP4208758A1 (fr) 2020-09-04 2021-08-26 Procede de fabrication d'une piece en materiau dur avec un insert en polymere

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EP (2) EP3964895A1 (zh)
JP (1) JP7529887B2 (zh)
CN (1) CN116097179A (zh)
TW (1) TWI810626B (zh)
WO (1) WO2022048983A1 (zh)

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US20220355373A1 (en) * 2021-05-07 2022-11-10 Comadur Sa Support frame for a method for sintering a body, in particular for watchmaking
DE102022114229B3 (de) 2022-06-07 2023-10-26 Porsche Lifestyle GmbH & Co. KG Uhrengehäusegrundkörper, Uhr und Verfahren zur Herstellung einer Uhr

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EP0964318A1 (fr) * 1998-06-08 1999-12-15 Montres Rado S.A. Elément de construction en matériau dur pour montre-bracelet
WO2001060581A1 (en) * 2000-02-17 2001-08-23 Cerabio, Llc Injection molding with sacrificial inserts
WO2014111786A1 (fr) * 2013-01-17 2014-07-24 Tih Sa Technique Et Innovation Horlogère Procede de fabrication d'un objet d'une forme choisie par injection sous pression en matiere ceramique ou refractaire

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US6502982B1 (en) * 1998-06-05 2003-01-07 Montres Rado Sa Structural component made of hard material for a wristwatch
JP2011503343A (ja) 2007-11-19 2011-01-27 イー・アイ・デュポン・ドウ・ヌムール・アンド・カンパニー 改善された接着性を有する成形品を製造するためのポリアミド組成物の使用、その成形品およびかかる材料の接着方法
KR101052324B1 (ko) 2011-03-23 2011-07-27 신한다이아몬드공업 주식회사 봉지재 성형 방법
CH707424B1 (fr) * 2012-12-21 2019-08-30 Rolex Sa Céramiques techniques colorées et procédé pour leur obtention.
EP3170579A1 (fr) 2015-11-18 2017-05-24 The Swatch Group Research and Development Ltd. Procédé de fabrication d'une pièce en métal amorphe
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EP3587625A1 (fr) * 2018-06-28 2020-01-01 Comadur S.A. Procédé de fabrication de pièces décoratives

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EP0964318A1 (fr) * 1998-06-08 1999-12-15 Montres Rado S.A. Elément de construction en matériau dur pour montre-bracelet
WO2001060581A1 (en) * 2000-02-17 2001-08-23 Cerabio, Llc Injection molding with sacrificial inserts
WO2014111786A1 (fr) * 2013-01-17 2014-07-24 Tih Sa Technique Et Innovation Horlogère Procede de fabrication d'un objet d'une forme choisie par injection sous pression en matiere ceramique ou refractaire

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220355373A1 (en) * 2021-05-07 2022-11-10 Comadur Sa Support frame for a method for sintering a body, in particular for watchmaking
DE102022114229B3 (de) 2022-06-07 2023-10-26 Porsche Lifestyle GmbH & Co. KG Uhrengehäusegrundkörper, Uhr und Verfahren zur Herstellung einer Uhr

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JP7529887B2 (ja) 2024-08-06
EP4208758A1 (fr) 2023-07-12
TWI810626B (zh) 2023-08-01
JP2023534522A (ja) 2023-08-09
US20230264396A1 (en) 2023-08-24
WO2022048983A1 (fr) 2022-03-10
TW202212293A (zh) 2022-04-01
CN116097179A (zh) 2023-05-09

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